Messages in this thread | | | Date | Wed, 22 Dec 2004 20:45:27 -0500 | From | Theodore Ts'o <> | Subject | Re: [linux-usb-devel] Re: RFC: [2.6 patch] let BLK_DEV_UB depend on EMBEDDED |
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On Wed, Dec 22, 2004 at 02:10:00AM -0600, Rob Browning wrote: > The sample Kconfig warnings I saw posted later in this thread would > certainly have given enough information to know to avoid the driver, > though if true, this might be even clearer: > > Note: this driver does not coexist well with usb-storage, and > usb-storage is is often the best driver for common devices like > external drive enclosures. At the moment, usb-storage may peform > dramatically better for those devices. > > If you're not certain you need this driver, you should probably > say 'N' here, and choose usb-storage instead.
The other caveat which is worth adding is that currently, the UB device only supports a single LUN. Some devices, most notably USB readers that support multiple types of compact flash/secure digital/smart media/et.al., and the PalmOne T5 PDA export multiple LUN's.
(I was scratching my head for a while trying to figure out why the T5 documentation claimed that you could access both the internal flash memory as well as the Secure Digital external memory via the USB interface until I realized it was because I was using the UB driver, and it didn't support multiple LUN's.)
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